You had a 400. You now have a 455+ whatever additional bore it takes to clean the cylinders. Let's say for the sake of arguement that you now have a 460.
You have 60 additional cubes. A mild performance engine develops "something" like 1.1 hp per cube, and perhaps 1.3-1.5 ft/lbs per cube. (Your definition of "mild" may vary.) So you've added something like 66 horsepower and maybe 80 ft lbs.
A dyno will tell you for sure. I'd be concerned about Communist Chinese cranks and cast pistons holding up for any length of time. Don't run lean, don't detonate, don't crossfire, don't over rev. Of course, that's good advise no matter what parts go in the engine.
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